Chromosomal Localization of QTLs Controlling Genotype X Environment Interaction in Wheat Substitution Lines Using Nonparametric Methods

  •  Ezatollah Farshadfar    
  •  Hooshmand Safari    
  •  Anita Yaghotipoor    


To locate the genes controlling grain yield stability, substitution line of Cheyenne (as donor) into the genetic background of Chinese Spring (as recipient) and their parents were used in a randomized complete block design with three replications under two different conditions (rain-fed and irrigated) for two years. Interrelationship among nonparametric measures showed that non-parametric statistics Si(1), Si(2)Si(3), Si(6), NPi(1), NPi(2), NPi(3), NPi(4), ?r and ?gy were significantly (P<0.01) correlated and exhibited negative and significant (P<0.01) correlation with grain yield, while the statistics RS, TOP and Kr revealed positive and significant correlation with grain yield. The results of spearman’s rank correlation were confirmed by Ward’s hierarchical cluster analysis. Principal components analysis indicated that the two first components explained 92.68% (77.71 and 14.97% by components 1 and 2, respectively) of the total variance. Screening nonparametric estimates using biplot technique based on two first components classified the stability measures in 2 groups. Nonparametric statistical procedures and ranking method indicated that most of the quantitative trait loci (QTLs) involved in controlling phenotypic stability in wheat are located on the chromosomes 2A, 3A and 4A in A genome and 3D and 5D in D genome.

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